#include<stdio.h>
int judge(char a)
{
    if ((a >= 'a' && a <= 'z') || (a >= 'A' && a <= 'Z'))
        return 1;
    else
        return 0;
}
int main()
{
    int ch;
    while ((ch = getchar()) != EOF)
    {
        if (judge(ch))
            printf("%c is an alphabet.", ch);
        else
            printf("%c is not an alphabet.", ch);
        getchar();
        printf("\n");
    }
}